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Feb, 20, 1923. 1,445,811

M. P. wETMoRE APpARA'TUs Fon EXHAUSTING INCANDESCENT ELECTRIC LAMPS ANDSIMILARARTICUES Feb. -20, 1923.

' 1,445,81 l M. P. Wl-:TMORE APPARATUS FOR EXHAUSTING INCANDESCENTELECTRIC LAMPS AND SIMILAR ARTICLES Filed Nov. 5, 1918 3 sheets-sheet 2Mr P. wETMoRE .1y-minvws FOR EXHAUSTING INCANDESGENT ELECTRIC LAMPS ANDSIMILAR ARTICLES Filed Nov. 5, 1918 sheets-shee 5 I 7 it a R1 1 i' u 2%Pawnee Feb. 2o, vi923.

essere aar naar ca `riruma r. wart/10aa, or NEWARK, Newl azaasiiz,Assreim.a vro rivaal-inn :alternare me co. me., a coereaafrron or newJenaer;

Primaires Foa Exir'ausrme rncsimsscnnr Eiscreme' maries aim sri/rune'ARTICLES.' 'f

Applicationy led November 5, 1915. Serial N07l 261,287.

VTo all uff/om may concern."

Be it yknownA that-l, MIN'ER l). lVn'iironn,

a citizen ofthe United States of America,

residing at Newark, county of Essex, State ofNew Jersey, vhave inventedcertain new and useful lmproveni'ents in Apparatus for` ExhaustingIncandescent Electric VLamps and Similar` Articles, yof which the'followingis a specification. l

My inventionrelates generally to apparatus for exhausting or evacuating`the conek tents of air`tight vessels, but is herein' def? scribed andshown in theparticiiilar embodiment designed for use in exhausting'incandescent electriclamp bulbs.

The development ofthe rotary air p ump working under an oil seal hasreached a lstate` ofV efficiency` such that a pump will y'exhaust theairr from astandard electric lamp bulb in a few minutes. These pumps aresmall and light and l have found that a series of them can be rmountedon afslowly rotating table which will bring the lamps attached to thepumps in succession within the reach of a stationary operator, so that.if the pumps are .operated simultaneously with the Vrotation of thetable, a lamp bulb inserted in the receiving socket of the particularpump before the operator at any time :will have been exhausted and readyfor sealing ofi' by the time'the table has madefone complete rota- 4tionand brought the lamp back to the opera-tor forsealing off. The best formof apparatus at present known to me embodying the Vabove suggestedinvention is illustrated in the accompanying three sheets of drawings inwhich: y

Fig. 1 is a vertical, aXial section of the apparatus taken through theaxes of the principal driving shafts. with parts broken away.

Fig. 2 is a plan view.

Fig. 3 is a horizontal 'section taken on the broken line 3-3 of Fig.1,'looking downward, with the table indicated in outline y broken away.f

Fig. f1 is a partial detail vertical section on line ,4 4 of Fig. 1, and

Fig. 5 is a detail verticalsection on line 5 5 of Fig. 1.`

Throughout the drawings like reference characters indicate like parts.

1, is thesupporting bed, resting on legs 2, 2, and provided withcircular ball races f 3, 23, for ball bearings on `which rest the rotaryvtable T his table is centered by vertical shaft 5. )assm throuoh andfour- 1 l 1 b nailed in` boththe table andthe bed. ,l

@n the ltable are. mounted a" series of rotary, oil-scaled airpumps 6,6', of a standard construction which are so geared' as to be driven fromcentering shaft 5. .Preferably l arrange them with their shafts 7, T,radi ally of the table so they can conveniently be connected throughbevel gearing 8, to shaft For most'e'l'licient-operation l lplaceasVpumps 12.12, which'may be made of larger' sizev 'than 'the primarypumps 6, 6, as indicated in Fig. 1. .y

For convenience in removing and replarw ing the pumps I prefer to employan axially separable connection or clutch in each pump drivinggearing,v'such vas 'the double crank' disc 13, on'pump shaft 7,'carrying crank pins 111,14, which are L`in the pathof cross pin' 15,.carried by shaft 16, journalled in bearings on the table and carryingone element of bevel gearing 8, on its other end.

The backing up pumps 12, 12, are driven from the nearest primary pump asby tooth gearing 17.- from the crank discs 13.

18, is the usual short section of stiff rubber .tubing mounted on thesuction nipple of each pump and adapted to receive, and make air tightconnection with, the tube of a tubuvlated lamp bulb 19.

For rotating the table slowly l prefer to employ a horizontal gearv20,011 the under side of the table meshing with. pinion 21, on short,vertical jack shaft 22, journalle'd in the .bed 1. This shaft is drivenby any convenient further reduced-speed gearing from centering shaft Irhave shown a 'worm gearing 23,' fro-m horizontal ack shaft 24, whichis-driven by bevel gearing 25, from shaft 5. y

The above describedinterconnected system of gearing may be driven bymain driving shaft 26, journalled on the bed 1, and supporting leg 2,Aand equipped with fastand-loose pulley 27, and bevel pinion 28. V Inoperation, the operator sits near the eol on it. The operator sticks thetube of the lamp bulb in the rubber 1S, of each pump G, as it comesWithin his reach,vand by the time the last pump has been so equipped,the one first so equipped comes into reach again. During the rotation ofthe table the pumps have been exhausting this lamp so that by the timeit comes again in reach the vacuum is complete and the operator sealslit off, removes from the rubber the stub end of the tube, and insertsthe tube of another lamp bulb in it. He then seals off the lamp from thenext approaching pump and so on.

The function of the bucking-up pump 12, is of course, the creation of aconsiderable vacuum at the exhaust ports of the primary pumps, andthereby take a portion of load oil the primary pumps and their seals.

. If any one of the pumps begins to Work badly, it can be unscrevvedfrom the table and another substituted in a few moments, the drivingconnection being automatically broken and reestablished by the movementof the pump Without attention from the operator. Each pump 6, is astandard unit mounted on a base by which it may be quickly screwed orotherwise fastened to the table 4, in a predetermined position forengagement of the driving clutches, or as quickly removed anddisengaged.

The main advantage of my invention arises from the combination of thebenefits of a direct connection from pump to lamp,

which avoids leakage (heretofore realized only in single pumpoperation), with the savingr of time resulting from operating atravelling,r bank of pumps by one operator,

so that the highest possible rate of output of f said pump being:provided with a socket connected to its inlet port adapted to connectwith a bulb to be exhausted, a backing pump also mounted on the sameytable inside the first mentioned circle of pumps and having its inletconnected directly to the outlets of saidirst mentioned series of pumps,mechanism for rotating said table slowly, and gearing from saidmechanism for simultaneously driving all said pumps at proper speed whensaid table is rotated.

MINER P. WETMORE.

Witnesses t JANE PoULsoN, HARVEY W. HARPER.

